package org.apache.maven.plugin;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.lang.reflect.Array;

import org.codehaus.plexus.component.configurator.ConfigurationListener;
import org.codehaus.plexus.logging.Logger;

/**
 * Log at debug level the mojo configuration.
 *
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 */
@Deprecated
public class DebugConfigurationListener implements ConfigurationListener {
  private Logger logger;

  public DebugConfigurationListener(Logger logger) {
    this.logger = logger;
  }

  public void notifyFieldChangeUsingSetter(String fieldName, Object value, Object target) {
    if (logger.isDebugEnabled()) {
      logger.debug("  (s) " + fieldName + " = " + toString(value));
    }
  }

  public void notifyFieldChangeUsingReflection(String fieldName, Object value, Object target) {
    if (logger.isDebugEnabled()) {
      logger.debug("  (f) " + fieldName + " = " + toString(value));
    }
  }

  /**
   * Creates a human-friendly string represenation of the specified object.
   * 
   * @param obj The object to create a string representation for, may be <code>null</code>.
   * @return The string representation, never <code>null</code>.
   */
  private String toString(Object obj) {
    String str;
    if (obj != null && obj.getClass().isArray()) {
      int n = Array.getLength(obj);
      StringBuilder buf = new StringBuilder(256);
      buf.append('[');
      for (int i = 0; i < n; i++) {
        if (i > 0) {
          buf.append(", ");
        }
        buf.append(String.valueOf(Array.get(obj, i)));
      }
      buf.append(']');
      str = buf.toString();
    } else {
      str = String.valueOf(obj);
    }
    return str;
  }

}
